package com.zjz.filter;

import com.zjz.util.Constant;

import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        Object user_session = request.getSession().getAttribute(Constant.USER_SESSION);
        //不成功，打回去
        if(user_session == null){
            response.sendRedirect("/hello/error.jsp");
        }
        filterChain.doFilter(servletRequest,servletResponse);
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}
    @Override
    public void destroy() {}
}
